On version 1.17 I am getting around 70 FPS with V-Sync off. My CPU and GPU usages are very low and ram usage is about half. I am getting 20% CPU usage, 9% GPU usage, and 50% ram usage. On previous versions I would push over 144 FPS even on demanding worlds. I have heard from multiple people that they're also experiencing very low FPS on the new update as well. I have tested going from one world in 1.16.5 to 1.17 and can see a large drop while on 1.17.